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Runway Incursion by Airfield Maintenance Vehicle at Changi Airport on 22 June 2016

SG

On June 22, 2016, a Boeing B777-300ER was involved in an aviation accident near SG. No fatalities were reported. Investigators recorded the probable cause as: The cause of the triggering of the AGLCMS MBD was Rover 32’s crossing unknowingly past the MBD at Taxiway W1 which he attributed to his focussing on looking out for defects along Taxiway V1 and W1 and thus missing the instruction markings painted on the… This summary draws on records from the Singapore Transport Safety Investigation Bureau (TSIB).

Sourcesthe Singapore Transport Safety Investigation Bureau (TSIB)Primary reportUpdated 2026-10-18Data APIEditorial standards

On 22 June 2016, a maintenance vehicle (Rover 32) crossed the runway holding position at Taxiway W1 without clearance while a B767 was approaching Runway 20R. The controller instructed the vehicle to vacate, and the aircraft landed safely. No injuries or damage occurred.

Synopsis

On 22 June 2016 at about 0940 local time, the Runway 1 Controller at Changi Tower observed an airfield maintenance vehicle, callsign Rover 32, moving on Taxiway W1 towards Runway 20R. The vehicle crossed the runway holding position without clearance, triggering a microwave barrier detector alarm. The controller immediately instructed Rover 32 to vacate the runway. An arriving B767 was cleared to land after the vehicle cleared the runway and landed safely. No damage or injuries occurred.

Factual Information

The driver of Rover 32 was a 66-year-old male employee of an airport maintenance service provider. He held a Category 1 Airfield Driving Permit and had 13.5 years of experience. On the day of the incident, he was tasked with inspecting taxiway pavement defects and markings. After attending a daily briefing, he requested and received clearance from Changi Tower to enter all taxiways. He proceeded to the WP/W1 junction area. According to the driver, he unknowingly crossed the runway-holding position because he was focused on looking for defects and missed the painted markings, stop bar lights, and runway guard lights. The vehicle reached about 60 m beyond the holding position but remained about 30 m from the runway edge.

The weather was clear with dry ground conditions. Recorded data from air traffic control audio and closed-circuit television were used for verification. A post-occurrence medical examination found no relevant medical or toxicological factors affecting the driver's performance.

Discussion

The investigation determined that the driver's crossing of the microwave barrier detector was due to his focus on inspecting pavement defects, causing him to miss visual cues. The report noted that a single person performing driving, communication, lookout, and inspection tasks faces competing attentional demands, which can affect situational awareness. The runway incursion warning system (AGLCMS MBD) in the control tower provided proactive detection and alerted the controller to the incursion.

Safety Actions

Following the incident, the airport maintenance service provider revised its procedures. Starting 24 June 2016, two employees are deployed for pavement inspections: one CAT 1 ADP holder drives and communicates with the tower, while the other inspects and maintains lookout. The company also shared lessons with operational staff. The aerodrome operator shared the occurrence with permit holders as a case study in its runway incursion prevention programme. No safety recommendations were proposed given the actions taken.

Probable cause

The cause of the triggering of the AGLCMS MBD was Rover 32’s crossing unknowingly past the MBD at Taxiway W1 which he attributed to his focussing on looking out for defects along Taxiway V1 and W1 and thus missing the instruction markings painted on the taxiway pavement, the stop bar lights and the runway guard lights.

Frequently asked questions

What happened in the 22 Jun 2016 Boeing B777-300ER accident near SG?

On 22 June 2016, a maintenance vehicle (Rover 32) crossed the runway holding position at Taxiway W1 without clearance while a B767 was approaching Runway 20R. The controller instructed the vehicle to vacate, and the aircraft landed safely. No injuries or damage occurred.

Were there any fatalities in the 22 Jun 2016 Boeing B777-300ER accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 22 Jun 2016 involved a Boeing B777-300ER, at SG.

What was the probable cause of the accident?

The cause of the triggering of the AGLCMS MBD was Rover 32’s crossing unknowingly past the MBD at Taxiway W1 which he attributed to his focussing on looking out for defects along Taxiway V1 and W1 and thus missing the instruction markings painted on the taxiway pavement, the stop bar lights and the runway guard lights.

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